NSCL, East Lansing, Michigan, USA
MSU, East Lansing, Michigan, USA
LBNL, Berkeley, California, USA
Heavy ion facilities such as the National Superconducting Cyclotron Laboratory (NSCL) often use ECR Ion Sources (ECRIS) for the production of highly charged ions to increase the efficiency of accelerating structures. Axial bremsstrahlung emission was studied on the Superconducting Source for Ions (SuSI) at the NSCL for 18 GHz and 13 GHz operation with oxygen. The hot electron temperatures were estimated from the bremsstrahlung high energy tail and seem to depend only on magnetic minimum in the same way as was found on VENUS [1], even in the case where 18 GHz and 13 GHz frequencies were compared for similarly sized ECR zones. Additionally, the time independent x-ray power increased at a significantly larger rate when operating the source in known regions of instability such as where the magnetic minimum approaches the ECR zone [2]. The results are discussed in the context of electron losses due to magnetic confinement.
*J. Benitez, et Al., in Proc. ECRIS'16, paper MOCO04.
**O. Tarvainen, et Al., Plas. Sourc. Sci. Technol., vol. 23, pp. 025020, 2014.
